Update BodyParser logic (#212)

* Update BodyParser logic

* update logic for byte[]

* small update

* MyGetKey

* myget

* dotnet nuget push

* dotnet build

* Release

* .

* StringContent

* 1.0.4.18-preview-02

* Debug

* 1.0.4.18-preview-02

* disable some proxy tests

* myget

* packagesToPack

* fix

* <AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>     <GenerateBindingRedirectsOutputType>true</GenerateBindingRedirectsOutputType>

* Release

* <VersionPrefix>1.0.4.18</VersionPrefix>

* fix

* BodyParserTests

* ResponseBodyData (#216)

* ResponseBodyData

* refactor tests

* LogEntryMapperTests

src/WireMock.Net/Http/StringContentHelper.cs

@@ -0,0 +1,38 @@
+using System.Net.Http;
+using System.Net.Http.Headers;
+using System.Text;
+using JetBrains.Annotations;
+using MimeKit;
+using WireMock.Validation;
+
+namespace WireMock.Http
+{
+    internal static class StringContentHelper
+    {
+        /// <summary>
+        /// Creates a StringContent object. Note that the Encoding is only set when it's also set on the original header.
+        /// </summary>
+        /// <param name="content">The string content (cannot be null)</param>
+        /// <param name="contentType">The ContentType (can be null)</param>
+        /// <returns>StringContent</returns>
+        internal static StringContent Create([NotNull] string content, [CanBeNull] ContentType contentType)
+        {
+            Check.NotNull(content, nameof(content));
+
+            if (contentType == null)
+            {
+                return new StringContent(content);
+            }
+
+            if (contentType.Charset == null)
+            {
+                var stringContent = new StringContent(content);
+                stringContent.Headers.ContentType = new MediaTypeHeaderValue(contentType.MimeType);
+                return stringContent;
+            }
+
+            var encoding = Encoding.GetEncoding(contentType.Charset);
+            return new StringContent(content, encoding, contentType.MimeType);
+        }
+    }
+}